﻿using Microsoft.SharePoint.Client;
using System;
using System.Net;

namespace Office365.SharePointOnline.Cmdlets
{
    [System.Management.Automation.Cmdlet(System.Management.Automation.VerbsCommon.Get, "GroupMembers")]
    public class Get_GroupMembers : System.Management.Automation.PSCmdlet
    {
        [System.Management.Automation.Parameter(Position = 0, Mandatory = true)]
        public string Url;

        [System.Management.Automation.Parameter(Position = 1, Mandatory = false)]
        public string User;

        [System.Management.Automation.Parameter(Position = 2, Mandatory = false)]
        public string Password;

        [System.Management.Automation.Parameter(Position = 3, Mandatory = false)]
        public string AuthenticationMethod;

        // use only if onpremise authentication
        [System.Management.Automation.Parameter(Position = 4, Mandatory = false)]
        public string Domain;

        protected override void ProcessRecord()
        {
            // check parameters
            ClientContext context = new ClientContext(Url);
            ICredentials credentials;
            Web web = context.Web;
            this.WriteVerbose("Logging on.");
            if (string.IsNullOrEmpty(Url))
            {
                this.WriteObject("Error: url is not set");
            }
            else
            {
                if (!string.IsNullOrEmpty(Password) && !string.IsNullOrEmpty(User))
                {
                    AuthenticationHelper authenticationHelper = new AuthenticationHelper() { AuthenticationMethod = AuthenticationMethod, Domain = Domain, Password = Password, User = User };
                    credentials = authenticationHelper.GetCredentials();
                    if (credentials != null)
                    {
                        context.Credentials = credentials as ICredentials;
                    }
                    else
                    {
                        throw new NullReferenceException("No credentials returned.");
                    }
                }
                else
                {
                    this.WriteVerbose("Reusing existing credentials");
                }

                this.WriteVerbose("Getting members from the group.");
                context.Load(web);
                context.ExecuteQuery();

                GetMembers(context, web);
            }
        }

        private void GetMembers(ClientContext context, Web web)
        {

            Group memberGroup = web.AssociatedMemberGroup;
            context.Load(memberGroup);
            context.ExecuteQuery();
            this.WriteObject(string.Format("Geassocieerde membergroup: {0}", memberGroup.LoginName));
            UserCollection users = memberGroup.Users;
            context.Load(users);
            context.ExecuteQuery();
            foreach (var user in users)
            {
                this.WriteObject(string.Format("User: {0} Email: {1} PrincipalType: {2}.", user.LoginName, user.Email, user.PrincipalType.ToString()));
            }
        }
    }
}
